The greenhouse effect is a result of

a. absorption and radiation of energy in the hydrosphere.
b. reflection of solar energy by cloud cover.
c. absorption and radiation of energy in the atmosphere.
d. aerosolization of dust and gases produced by volcanoes.

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed